'Priests' in the Bible

Only the ground of the priests he hath not bought, for the priests have a portion from Pharaoh, and they have eaten their portion which Pharaoh hath given to them, therefore they have not sold their ground.

and Joseph setteth it for a statute unto this day, concerning the ground of Egypt, that Pharaoh hath a fifth; only the ground of the priests alone hath not become Pharaoh's.